Tempering apparatus



L. A. FRAYER- AND W. J. MlLLER.

' TEMPERING APPARATUS.

I V APPL'ICATION'HLED JUNE 5. 1'920. I

1 41631 1 Patented May 23, 1922.

2 SHEETS-SHEET l.

- avwe/wifoz ,L'eeAFmy 61" William mar Mo magma L. A. PRAYER AND w. J. MILLER.

TEMPERING APPARATUS APPLICATION mp0 JUNE 5. 1920.

. Patented May 23,1922.

2 SHEETS-SHEET 2.

brittle exterior LEE A. PRAYER AND 'W'ILLIAM -J.. MILLER, 0F COLUMBUS, OI-IIO.

TEMPERING APBABATUS.

arsen;

Specification of Letters Patent.

Patented May 23, 15922.

Application filed June 5,1920. Serial No. 386,684.

To aZZ i0 liom it may concern Be it known that we, A. FRAYER and IVILLIAM J. MiLLnn, citizens of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Tempering Apparatus, of which the following is a specification.

The object of this invention is to avoid the slow and tedious process of annealing articles of metal-especially the leaves of vehicle springs. Such leaves are best suitable for hard usage when they have a tough flexible interior portion or corewith a hard tempered envelope. Generally we use the oil tempering process but we have found that the immersion of the hot metal should beso regulated or timed as to bring the article out of the oil with enough heat left in the interior of the piece to anneal the chilled and leave the interior flexible and tough.

Qur invention is embodied in an improved machine for accuratelyregulating or timing the immersion so as to secure the result indicated substantially as hereinafter described, the features of novelty being finally claimed.

In the accompanying drawings forming a part hereof Figure 1 is an end. view with out to show the details. i

Fig. 2 is a top plan view broken near the middle for convenience in illustration.

Fig. 3 is a side view of a thermostatic regulator. I

Fig. 4 is an elevation looking at the right hand side of the thermostatic regulator as shown in Fig. 8. a f In the views 5 designates the tank to containthe tempering .oil. Journaled on the opposite ends of the tankis a reel like frame comprising ashaft 6 to the opposite ends of parts broken which are similarly arranged spiders 7, 7

between the ends of the corresponding arms of which are journaled shafts 8. Aifixed to the shafts 8 are hook shaped-holders 9, which receive the spring leaves to be tempered. Each of the shafts 8 at one end of the frame 5 i is important that the speed of the reel be regulated accordingly. To accomplish this reel-likeframe comprises the following elements, towit: A motor 11, the shaft 12 of which is provided with one or more splines 13; Slidable on but turning withthe shaft 12 by means of the splines is a friction wheel 14; engaging a disk 15 to turn the same. The shaft of the disk 15 is provided with a pinion 16 engaging a small spur gear 17, the shaft of which has a pinion 18 engaging a larger spur gear 19, the latter having on its shaft a pinion 2O engaging a large spur gear 21. The shaft of the spur gear 21 has fixed to it an elliptical gear 22 engaging a similar elliptical gear 23, the shaft of which is provided with a small spur gear 24- to engage a large spur gear 25 on the shaft of the reel-like frame. In operation the frame rotates clockwise as viewed in Fig. 1.

In the particular instance shown the spiders each have three arms to provide for three immersions in one revolution of the reel-like frame, and the arrangement of gearing is such as to permit the elliptical gears to cause each of'the shafts carrying the holders 9 to quickly iinmerge and emerge but to pass slowly through the oil after immersion.

Secured to a standard 26 on that end of the tank carrying the rotating mechanism is acam bar 27 (shown in broken lines Fig. 2) against which the toothed sector 10 bears as tlieholder 9 approaches the bath. The function of this cam bar is to temporarily delay the entrance of the holder and the article to be tempered into the oil but permit a. quick immersion thereof when the sector passes the lower end of the cam bar. In this quick immersion gravity supplements the motion ofthe rotary frame. Secured at the oppo site side of the tank is a stationary sector rackQ'i' that is engaged by the sector 10 when'the latter rises so as to cause a quick emersion of the holder 9 and its burden. In-

cidentally the rack causes an inversion of .Fig. l, and ready to receive another article .to-be treated.

As the temperature of the bath varies it regulation we include a yoke lever 28 pivoted at 29, the yoke of said lever engaging a groove 14 in the friction wheel 14 so that said friction wheel can be thereby shifted to bear on the disk 15 at different tions and when the body emerges the hot distances from the center of the latter. As the speed of the motor 11 is kept substantially constant the speed of the dislcand the mechanism driven thereby can be varied by shifting the driver 14:. To cause the shifting of the yoke lever 28 according to variations in the temperature of the bath there is provided a thermostat including a frame 31 supporting a bar 32 fixed at its lower end only so as to be expansible upward when subjected to an increase of heat and contraotible downward upon a diminution of heat. This frame is positioned on ,the tank to extend into the bath and so that the upper end of the bar 82 can impinge upon the short arm of a bell crank lever 33, the other arm of said lever bearing upon the short arm of the fork lever 28. Upward expansion of the thermostatic bar 32 retards the operation of the machine while contraction of the bar 32 permits an acceleration thereof through the action of the spring 33 connecting the lever 28 with an arm on a saddle 34;.

The fork-lever, the bell crank lever and the thermostat are mounted upon the saddle 34:, said saddle being adjustable and also fixable by a set screw 36 on a table 35 in a plane parallelwith the face of the disk 15. The operation of the mechanism can, by the last described adjustment, be varied for articles of different weight or dimensions.

The quick immersion of the article treated as herein described. insures an even tempering thereof. An advantage of the quick emersion is that the hot article is promptly removed to a considerable distance from the body of the oil in the tank so that if ignition or flashing of the oil clinging to the article takes place danger of ignition of the body of theoil is negligible. When a body thus treated is passed through the oil its surface and exterior portions are cooled more than the interior porter interior portion efiects an annealing of "the exterior portions.

The forms of the parts can be varied without departing from the gist of the inrelation as claimed.

What we claim is 1. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier for the article to be tempered adapted to carry the article into and out of the bath and mechanism for; revolving said carrier adapted to cause a quick immersion of the article treated and a relatively slow motion of the article through the bath. 1

2. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier for the article to be and out of the bath and mechanism for re volving said carrier adapted to cause a quickimmersion and emcrsion oi the article treated and a relatively slow motion of the article through the bath.

3. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier including a swinging holder for the article to be tempered and means for automatically andstemporarily delaying the movement of: the swinging holder until its near approach to the bath and permitting its rapid movement into the bath.

4. In a tempering mechanism, in combination with a tank to contain the bath, a revolving carrier including-a swinging holder for the article to be tempered, means for automatically and temporarily delaying the movement of the swinging holder until its near approach to the bath and permitting its rapid movement into the bath and means for quickening the movement of the holder out of the bath.

5. In a tempering mechanism, in combination with a tank to contain the bath, a revolving carrier including a swinging holder for the article to be tempered, means for automatically and temporarily delaying the movement of the swinging holder until its near approach to the bath and permitting its rapid movement into the bath and means for quickening the movement of the holder out of the bath, said last named means also adapted to cause an inversion of the holder to discharge its burden.

6. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier for the article to be tempered adapted to carry the article into and out of the bath, a motor and gearing between the motor and carrier for revolving the carrier including speed varying members adapted to cause a relatively slow movement of the article treated through the bath,

7. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier for the article to be tempered adapted to carry the article into and out of the bath, mechanism for causing a relatively slow movement of the article through the bath, and means for regulating said movement according to the temperature of the bath.

8. In a tempering mechanism, in combination with a tank to contain a bath, a revolvingcarrier for the article to be tempered adapted to carry the article into and out of the bath, mechanism for causing arelatively slow movement of the article through the bath and thermally controlledmeans for regulating said movement according to the v temperature of the bath. tempered adapted to carry the article into '9. In a tempering mechanism, incombination with a tank to contain a bath, a revolving carrier for the article to be tempered adapted to carry the article into and out of the bath, mechanism for causing a relatively slow movement of the article through the bath, thermall 1 controlled means for regulating said movement according to the temperature of the bath and means for adjusting said thermally controlled means.

10. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier including a swingin holder for the article to be tempered and a stationary cam bar acting on the swinging holder for temporarily delaying the movement thereof until its near approach to the bath.

11. In a tempering mechanism, in combination with a tank to contain a bath, a revolving carrier carrying a rotary shaft, a swinging holder for the article to be temchanging the position pered connected with said shaft, a sector gear on said shaft, a cam bar at one side of the tank "for delaying the movement of the swinging holder until its near approach to the bath, and a rack at the opposite side of the tank to be engaged by the sector gear to cause quick movement of the article treated from the bath.

12. In a tempering mechanism, bination with a tank to contain a bath, a revolving carrier for the article to be tempered adapted to carry the article into and out of the bath, mechanism for causing a relatively slow movement of the article through the bath, thermostatic means for regulating said movement according to the temperature of the bath, and means for of the thermostatic in commeans.

LEE A. FRAYER, WILLIAM J. MILLER. 

